Add minimum size to some debugger elements

[MewPurPur]

Fixes how certain parts of the debuggers can be shrunk down to disappear, to look really messed up, or to be drawn wrong. Fixes #97786

[hsvfan-jan]

Will this fix #97786, too?

[MewPurPur]

@hsvfan-jan The minimum size of the Breakpoints thingy is now enough to prevent you from being able to collapse it as much as you've shown, but I didn't change the default size. But still, this should address the issue, so I've edited the post to include this.

The second thing you've mentioned is likely a result of your theming. This is how it looks for me in 4.3:

So I'm not sure it's an issue, if you still think it is you should open a separate ticket.

[hsvfan-jan]

No, that'll be enough for me to fully close the ticket, thanks!

[Mickeon]

Are there other bottom-panel sections that have similar minimum limits?

[hsvfan-jan]

Are there other bottom-panel sections that have similar minimum limits?

I think this part could benefit from a bit more width to not have the scroll bar by default. It's legible as is, though, and not as "high priority" as the breakpoints I opened the bug for.

[Mickeon]

My question was more-so about most other panels. Because when the editor's window is very small, the minimum size will push the Inspector & other docks.
Either way, this PR is a good thing, but it needs to be as minimal as reasonable.

[MewPurPur]

All of the minimum sizes I've modified add up to significantly less than the required UI in some of these sections, like the lines of buttons on top. The minimum sizes are very tame, just enough to not look messed up.

[akien-mga]

Thanks!