[textinput] advance cursor when typing in overwrite mode

[ferdymercury]

This Pull request:

Changes or fixes:

as in bash. fyi @amadio

Fixes #21457

Checklist:

• tested changes locally
• updated the docs (if necessary)

[github-actions]

Test Results

    23 files      23 suites   3d 18h 13m 58s ⏱️
 3 878 tests  3 877 ✅ 0 💤 1 ❌
78 983 runs  78 982 ✅ 0 💤 1 ❌

For more details on these failures, see this check.

Results for commit e17ffb5.

[dpiparo]

Thanks for this change!! I am not sure it's possible to do at all, and the PR could be merged as is, but have you thought about a way to test this, in order not to encounter the problem ever again?

[ferdymercury]

but have you thought about a way to test this, in order not to encounter the problem ever again?

This should do it, but I do not know if this is cross platform (not gonna work for Windows?) nor where it should go within the roottests.

echo -e "ab\033[D\033[D\033[2~.q\n" | root -b -l
// Simulates writing ab, two left-arrow presses, Ins press, and then writing .q

Before:

input_line_9:2:3: error: use of undeclared identifier 'qb'
 (qb)
  ^~
Error in <HandleInterpreterException>: Error evaluating expression (qb)
Execution of your code was aborted.

After: ROOT exits fine without errors.