Goal
When clicking on the tab-title of the sidebar, the focus should always be set on the content-area of the tab. So, it should have exactly the same behavior like clicking on a tab-title of the editor.

Current situation & explication
When clicking on a tab-title of the sidebar, the focus is not always on the content-area of the tab (see down below from "Conditions" till "Remark III"), while when clicking on a tab-title of the editor, the focus is always on the content-area of the tab. The reason for this different behavior is: The sidebar uses the GTK default behavior while the editor does not use the GTK default behavior.

Conditions

enable the sidebar
in the sidebar: enable the tab with the title Symbols and the tab with the title Documents
turn off all plugins, to be sure that the issue has not something to do with plugins
open some documents in Geany

Steps to reproduce

click in the editor
click in the sidebar on the tab-title Documents
with the mouse: mark the first item from the top (result: the first item is marked)
click in the editor
click in the sidebar on the tab-title Symbols
click in the sidebar on the tab-title Documents
press 1x the arrow-down key on the keyboard (result: the next item is marked; so, that means that the release of a click on the tab-title after 6 made the content-area of the tab in focus)
click in the editor
click in the sidebar on the tab-title Documents
press 1x the arrow-down key on the keyboard

Expectation
the next item should be marked

Result
nothing visible happens; that means that the release of a click on the tab-title in 9 didn't make the content-area of the tab in focus; so, the behavior after 6 is not the same behavior like after 9; but there is something that happens even if it is not visible: after having pressed 1x the arrow-down key on the keyboard in 10, the focus moves from the tab to the content-area of the tab because if one press again 1x the arrow-down key on the keyboard, then the next item is marked; see also "Remark I" down below

Remark I
in 3: instead of the first entry, mark the last entry; then do 4 to 6; then in 7 press 1x the arrow-up key instead of the arrow-down key on the keyboard to mark the item before the last item; then do 8 and 9; then in 10 press 1x or several times the arrow-up key instead of the arrow-down key on the keyboard; there will be no change; one have to press first 1x the arrow-down key (!!) on the keyboard to move the focus from the tab to the content-area of the tab; then press 1x the arrow-up key on the keyboard to mark the second last item

Remark II
one can do "Steps to reproduce", but without 8

Remark III
in "Steps to reproduce" one need first to click in the editor, then on the tab-tile "Symbols" and then on the tab-title "Documents", so that the release of the click on the tab-title will put the content-area of the tab in focus; but there is also a second possibility to put the content-area of the tab in focus: if the tab-title "Symbols" is active while the editor has focus, and then if one click on the tab-title "Documents"

History
I reported the issue already in the year 2021 on the website of the plugin Preview (xiota/geany-preview#15) because to that time I thought that the plugin Preview was the problem. But last week I could reproduce the issue while all plugins were deactivated. That means that not the plugin Preview is the problem, but Geany. Last week I opened at geany the issue 3961 with the title BUG: A release of a click on a tab-title of the sidebar does not put always the content-area of the tab in focus because I was sure that there is a bug in the sidebar.

System
Lubuntu 24.04
Geany 2.0

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