FMSLogo Code

Fix bug #2452726; BITLOAD, BITSAVE, BITLOADSIZE, GIFLOAD, GIFSAVE, and GIFSIZE now throw image-specific errors and no longer display dialog boxes when given bad input.

Note that the helper routines which are called for GUI actions and logo instructions had to be reworked to return error codes so that the caller could decide if they wanted to throw a logo error or display a dialog box.

Tighten up the bad input tests to expect specific errors to be thrown, instead of expecting any error.

Add some bad input tests for BITLOAD and BITSAVE.

Fix an error in the sample code for SCROLLBARCREATE. This error was reported by Daniel Ajoy.

Fix an error in the sample code for CREATESCROLLBAR. This error was reported by Daniel Ajoy.

Formally thank Ralf Kurth, who reported a bug that when users of non-English versions of FMSLogo redefine a Logolib procedure, their version disappears from the workspace.

Formally thank Hensley Bass for his contributions to the Logo extras package.

Fix bug #1622756; SETBITMODE now throws a recoverable bad input error when given an integer that is out-of-range.

Fix bug #1620964; SETTURTLEMODE now throws a recoverable bad input error when given an integer that is out-of-range.

Add some additional bad input tests for SETBITMODE, including type coercion and recoverable bad input tests.

Add a version of TRACEINSTRUCTION that doesn't attempt to catch errors when running the instruction. This is useful for when testing recoverable errors, since CATCH "ERROR effectively disables :ERRACT.