Fixed some static code analyzer warnings

[mbien]

fixed some endless recursion, NPE and comparison issues. One commit per category.

edit: PR was inspired by this blog post but contains a few more changes

targets delivery

[mbien]

netbeans/java/form/src/org/netbeans/modules/form/layoutdesign/LayoutFeeder.java

Lines 3892 to 3901 in b2dffef

	for (int i=LEADING; i <= TRAILING; i++) {
	if (LayoutInterval.canResize(gaps[i]) && !anyResizingNeighbor[i]
	&& (anyResizingNeighbor[i^1] || preferredFixedSide == i)) {
	operations.setIntervalResizing(gaps[i], false);
	if (!LayoutInterval.canResize(gaps[i^1])) {
	operations.setIntervalResizing(gaps[i^i], true);
	}
	break;
	}
	}

L3897 likely has to be i^1 but I wasn't sure. Maybe 0 is intentionally? I left it as is for now. Maybe something to revisit for NB 23

[mbien]

all tests green, got one timeout in the maven tests which is already tracked via #7263, the micronaut test step needed a restart too but those are known to be unreliable.

[matthiasblaesing]

Looks sane to me!

[mbien]

removed the two unused getHeight() methods of the MethodParamsTipPaintComponent copies (instead of attempting to fix them), and rebased onto latest delivery.

[ebarboni]

LGTM do ready to merge ?

[mbien]

yes should be ready