<Swing Dev> [10] RFR JDK-8191428: Regression: Swing button label wrapping with hidpi

[Prasanta Sadhukhan]

Hi All,

Bug: https://bugs.openjdk.java.net/browse/JDK-8191428

It is seen that with
8172025: HiDPI with non-integer scale factor - SPANs in HTML are 
rendered overlapping each other
fix, the html text in button is rendered in different lines even though 
it is specified as a one word.

This is because with getSpan() returning float value (say 29.9996)
FlowView.layoutRow() calculates "spanLeft" using getFlowSpan() method 
which uses "int" calculation (so get 29]
whereas "chunkSpan" got from GlyphView#getTabbedPane (using 
GlyphPainter1.getSpan) gets "float" value [ie 29.9996]
so this calculation (chunkSpan > spanLeft) is satisfied  [ex, 29.996 > 
29] and so it calls breakView() to break the text.

In the proposed fix, I have reverted the getSpan() value to return "int" 
so as to prevent this regression.
This fix also does not cause any problem with 8172025 issue which 
renders fine.

webrev: 
http://cr.openjdk.java.net/~psadhukhan/8191428/webrev-1stapproach/webrev.00/


Another approach is to use "float" calculation for all "spans" 
calculation but that will cause many changes, including changing 
public/protected method signature
which I believe is risky at this point of time for jdk10, as it might 
potentially cause more regressions.
Sneak peek of 2nd approach changes are:  [work in progress]
http://cr.openjdk.java.net/~psadhukhan/8191428/webrev-2ndapproach/

Regards
Prasanta