I've been unable to reproduce the crashes myself with 1.4.x on linux (I know Albrecht did).
I tried about 8 times could not replicate, wasn't sure how many times it took. My attempts:

1. Open unittests
2. Choose "simple terminal"
3. Wait a bit
4. Click the 'X' to close the window or hit ESC

Also tried selecting other tabs after (3).

That said, I created a branch 'issue89' in my fork with a suggested patch that does an early exit if the entire buffer is being deleted, using a new protected method empty_display() to clear the internals. I didn't super-carefully check every variable to see how the internals are managed.. it is a beast.. but perhaps this is a good general direction to go.

Also attaching a test program that cycles a single Fl_Text_Display through different buffer() values:

• a "large" text buffer (contains lots of aaa's..)
• a "small" text buffer (contains a few bbb's..)
• an "empty" text buffer (contains "")
• a null text buffer, e.g. buffer(0)

Each press of the "Cycle" button above the editor cycles through this list. Ran through valgrind, etc.
Wanted to make sure switching buffers worked correctly with these mods.
cycle_text_buffers.zip

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