In 2.10 go to "Edit/Preferences/Tool Options"

In the "Paint Options Shared Between Tools" set the "Brush" option.

This was the same in GIMP 2.8

In 2.8, Gimp kept the current brush size when you switched between brushes. In 2.10, whenever you switch to a different brush, it changes the size to the default size for that brush (51 for the basic round brushes). This is absolutely never the size I want.

Can I do either of the following:

-Change this setting so that it keeps the current brush size when you switch brushes, as it did in 2.8.

-Barring that, change the default brush size. This must be for ALL brushes--I can't use the brush editor to change them individually, as I have over 500 brushes.

I need to do one of these or else I'll have to revert back to 2.8. I don't have time to continually change back my brush size.

Sorry, misread your question as the brush size varying between tools.

I don't know whether this is a deliberate decision or an unwanted side-effect of the changes to the brushes - either way I can see what a pain it would be to those who use a number of brushes (it even resets the size when going back to a brush for which you have set the size!)

You could try reporting it as a bug - then we would find out if it was a deliberate change.

In the meantime I have a couple of suggestions.

Firstly the third post in the following thread describes how to set GIMP so that you can adjust the brush size using the mouse wheel.

http://www.gimpusers.com/forums/gimp-user/17876-changing-the-brush-sizes

Secondly it should be a simple exercise to write a script that would take as a parameter the brush size that you want to use. Running the script should set the brush size (using (gimp-context-set-brush-size size)). When you change brushes you would then simply have to re-run the script - use "Filters/Repeat Last" short-cut Ctrl-F (or you could change this short-cut to a single key press if you want). This would probably be the best approach short of getting the problem fixed. If you have problems writing a script let me know and I will see what I can do.

I tried that. It doesn't work. That setting is already checked but it keeps reverting the brush size anyway.

I have just written a script to set the brush size.

Put the script in your personal scripts folder.

The first time it is run (each GIMP session) it offers 15 as the default brush size - if you want a different default size just edit the 15 in line 40 to the value of your choice.

The script should appear in "Filters/Set Brush Size/Set Brush Size"

As I said above pressing Ctrl-F will simply repeat the script and set a new brush to the size last set by the script. Changing Ctrl-F to a single keypress would speed things. (this does assume that you aren't running other scripts in the mean time. If you are you could assign a short-cut to the Set Brush Size script - use the short cut, press Enter and you will have the last brush size that you set.

To set a different brush size for the script simply re-run it.

Hope this helps

Hold on, this is apparently a new feature not a bug. There's a new set of buttons in the toolboxes called "link to brush default" (next to the "reset to native size" buttons) and these are on by default. Turn it off and you should be good to go.

-- Stratadrake strata_ranger@hotmail.com
--------------------
Numbers may not lie, but neither do they tell the whole truth.

From: gimp-user-list  on behalf of programmer_ceds 
Sent: Wednesday, June 20, 2018 6:29:48 AM
To: gimp-user-list@gnome.org
Cc: notifications@gimpusers.com
Subject: [Gimp-user] Gimp 2.10: bush default size

Sorry, misread your question as the brush size varying between tools.

I don't know whether this is a deliberate decision or an unwanted side-effect of
the changes to the brushes - either way I can see what a pain it would be to
those who use a number of brushes (it even resets the size when going back to a
brush for which you have set the size!)

You could try reporting it as a bug - then we would find out if it was a
deliberate change.

In the meantime I have a couple of suggestions.

Firstly the third post in the following thread describes how to set GIMP so that
you can adjust the brush size using the mouse wheel.

http://www.gimpusers.com/forums/gimp-user/17876-changing-the-brush-sizes

Secondly it should be a simple exercise to write a script that would take as a
parameter the brush size that you want to use. Running the script should set the
brush size (using (gimp-context-set-brush-size size)). When you change brushes
you would then simply have to re-run the script - use "Filters/Repeat Last"
short-cut Ctrl-F (or you could change this short-cut to a single key press if
you want). This would probably be the best approach short of getting the problem
fixed. If you have problems writing a script let me know and I will see what I
can do.

>I tried that. It doesn't work. That setting is already checked but it
>keeps reverting the brush size anyway.

--
programmer_ceds (via www.gimpusers.com/forums)

Not what I would call obvious - but its the answer the OP was looking for. Thanks.

Hold on, this is apparently a new feature not a bug. There's a new set of buttons in the toolboxes called "link to brush default" (next to the "reset to native size" buttons) and these are on by default. Turn it off and you should be good to go.

-- Stratadrake strata_ranger@hotmail.com
--------------------
Numbers may not lie, but neither do they tell the whole truth.

Personally, I'd think the idea behind the "Link" buttons is that any changes you make to the brush settings in the Tool Options will be reflected in the brush file (as if you'd made those changes in the Brush Editor) and, thus, when you pick that brush again it will have the same settings you left it at the last time.

HOWEVER, this does not seem to be the case at all (nor is it helped by the built-in brushes being read-only) so essentially, the "Link" button is just an "auto-revert" function, which I cannot see any practical use for currently and have to wonder why someone thought it should be enabled by default. (anyone...?)

Just turn it OFF.

-- Stratadrake strata_ranger@hotmail.com
--------------------
Numbers may not lie, but neither do they tell the whole truth.

From: gimp-user-list  on behalf of programmer_ceds 
Sent: Thursday, June 21, 2018 7:22:22 AM
To: gimp-user-list@gnome.org
Cc: notifications@gimpusers.com
Subject: [Gimp-user] Gimp 2.10: bush default size

Not what I would call obvious - but its the answer the OP was looking for.
Thanks.

>Hold on, this is apparently a new feature not a bug.  There's a new
>set of buttons in the toolboxes called "link to brush default" (next
>to the "reset to native size" buttons) and these are on by default.
>Turn it off and you should be good to go.
>
>
>-- Stratadrake
>strata_ranger@hotmail.com
>--------------------
>Numbers may not lie, but neither do they tell the whole truth.

--
programmer_ceds (via www.gimpusers.com/forums)