OK. The culprit is eb772d0.

Luckily, this is a one-liner : add
oldTAWidth - 1;
after line 494 (as of eb772d0) in function Fl_Text_Display::resize().

This is visible as follows :
git reset -- hard eb772d0,
make a copy of src/Fl_Text_Display.cxx and FL/Fl_Text_Display.H
git pull -ff
copy the two saved files to src/ and FL/, respectively.
Build and run test/tree: 'SelectAll' and 'Deselect All' are slow and become slower and slower
each time they are used because the Simple Terminal contains more and more text.

Comment out the single line #495 in src/Fl_Text_Display.cxx to get
// oldTAWidth - 1;
This undoes eb772d0.
Build and run test/tree: 'SelectAll' and 'Deselect all' run quickly, and their run-time doesn't increase.

Greg: I propose to stop here and let you continue the analysis of this issue, if you agree.

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