Minimum width suggested (3) versus (2)

[Maspalio]

Hello,

Writing an extension built over 5E, i got an error message that i don't understand :

Ruleset Warning: framedef: Top edge width (2) of frame (windowtitle) less than minimum suggested width (3)
Ruleset Warning: framedef: Bottom edge width (2) of frame (windowtitle) less than minimum suggested width (3)
Ruleset Warning: framedef: Middle width (2) of frame (windowtitle) less than minimum suggested width (3)

I don't see where to fix this problem :

Base code (5E) is :
<offset>56,20,54,11</offset>

My change is :
<offset>95,52,146,30</offset>


Thanks for your help.

[damned]

what is the dimensions of your image?

[Maspalio]

243x86 px (vs 243x56 px for the 5E windowtitle image)

[damned]

You have insufficient pixels left for the middle slice.
You have allowed a width of 2px and a height of 4px.

[Maspalio]

Thanks damned.