Hello geany devs,

Before I describe this feature request, I am finally using geany AND also learning C++ (slowly ...). C++ is a lot more annoying than ruby but I guess the really interesting things are all in C/C++, so I knew I had to learn C and/or C++ eventually. But I digress.

To the topic:

- Currently, latest geany, you can easily change the size of the current tab.

That is, the content of that tab. So I can increase the font via pressing strg on my german layout keyboard (I guess this is ... control key? Very bottom left), then hit the mouse scrollwheel; upwards scrolling makes the font size larger. Downwards scrolling decreases font size.

This is GOOD and CONVENIENT. But I have one problem:

- Only the CURRENT tab is changed, not the other tabs. So this means that the corrent font size is in the current tab, but not the other tabs.

My proposal is thus to:

- Enable users to change the font size in all tabs simultaenously.

This should be trivial in that we could send the same command/event to all tabs, I think. (I know gtk only via the ruby-gtk bindings, but I remember that the gtk notebook tab would often keep all tabs as an array and one can address them and the buffer content).

So I think in theory, this feature should be trivial.

What may not be trivial is that perhaps some users may like the existing behaviour, I have no idea. I don't mind to retain the current status quo by the way, it is fine - but I would like to at the least have an ADDITIONAL way to specify so that I can change all tabs simultaneously.

I am not sure how to enable this best, but I will make two suggestions and I am sure IF it is a worthwhile change, the geany devs will think of an appropriate way (or another way; I am just trying to give ideas):

a) the simple one is to add a checkbox to options/preferences, something such as "synchronize changes to the font size" checkbox [yes/no] boolean flag, and a tooltip that says something like "Enabling this checkbox will apply font size changes to all tabs, not only the currently active tab." - or something like that.

b) another option may be to add another keybinding. For example, strg + mouse wheel currently works; we could add ANOTHER key to this such as ctrl+shift+mouse wheel combination. Or any other key - I don't mind so much which key. (Should be documented somewhere of course.)

of course (a) and (b) can also be combined so both could be added. I only wanted to provide a few ideas here. :)

Thanks for reading, feel free to close this issue at any moment in time!