fix(text): fix panic when rendering out of bounds

[joshka]

Previously it was possible to cause a panic when rendering to an area
outside of the buffer bounds. Instead this now correctly renders nothing
to the buffer.

[codecov]

Codecov Report

Attention: Patch coverage is 90.00000% with 1 lines in your changes are missing coverage. Please review.

Project coverage is 89.3%. Comparing base (8719608) to head (4ca7f48).

Files	Patch %	Lines
src/text/line.rs	75.0%	1 Missing ⚠️

Additional details and impacted files

@@           Coverage Diff           @@
##            main    #997     +/-   ##
=======================================
- Coverage   89.3%   89.3%   -0.1%     
=======================================
  Files         61      61             
  Lines      15295   15298      +3     
=======================================
+ Hits       13668   13670      +2     
- Misses      1627    1628      +1     

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