[Lazarus] Source Editor enhancement mini-patch

[Giuliano Colla]

Hi Lazarus team,

Lazarus IDE is IMO so superior to Delphi's that any comparison would be 
unfair.
However there's a Delphi IDE small feature which I miss when using 
Lazarus: a quick mouse access to the Jump Back/Jump Forward function, to 
navigate history. I find keyboard shortcuts (CTRL-H and Shift-CTRL-H) 
more cumbersome.

There's no easy way to add Icons to the NoteBook pages or tabs of the 
Source Editor window, so it came to my mind to add a source editor 
dedicated tool bar, to host those functions. It steals just 18 pixels in 
height, and one could take advantage of it to insert more editor related 
commands, which are now available in drop down menu's.

I attach a small patch to SourceEditor, just to show the idea. If 
accepted, it can be fully implemented, making it perhaps the umptieth 
option to the user configuration, extended, made fully configurable, etc.

If not, I'll just keep it for my personalized IDE.

(Double clicking on the added tool bar, it can be moved from top to 
right or to bottom. Quick and dirty just for testing the best position.)

Best,

Giuliano



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