* Fixed filename:page in logging
* Got CMap working for multi-rune entries
* Treat CMap entries as strings instead of runes to handle multi-byte encodings.
* Added a test for multibyte encoding.
* First version of text extraction that recognizes columns
* Added an expanation of the text columns code to README.md.
* fixed typos
* Abstracted textWord depth calculation. This required change textMark to *textMark in a lot of code.
* Added function comments.
* Fixed text state save/restore.
* Adjusted inter-word search distance to make paragrah division work for thanh.pdf
* Got text_test.go passing.
* Reinstated hyphen suppression
* Handle more cases of fonts not being set in text extraction code.
* Fixed typo
* More verbose logging
* Adding tables to text extractor.
* Added tests for columns extraction.
* Removed commented code
* Check for textParas that are on the same line when writing out extracted text.
* Absorb text to the left of paras into paras e.g. Footnote numbers
* Removed funny character from text_test.go
* Commented out a creator_test.go test that was broken by my text extraction changes.
* Big changes to columns text extraction code for PR.
Performance improvements in several places.
Commented code.
* Updated extractor/README
* Cleaned up some comments and removed a panic
* Increased threshold for truncating extracted text when there is no license 100 -> 102.
This is a workaround to let a test in creator_test.go pass.
With the old text extraction code the following extracted text was 100 chars. With the new code it
is 102 chars which looks correct.
"你好\n你好你好你好你好\n河上白云\n\nUnlicensed UniDoc - Get a license on https://unidoc.io\n\n"
* Improved an error message.
* Removed irrelevant spaces
* Commented code and removed unused functions.
* Reverted PdfRectangle changes
* Added duplicate text detection.
* Combine diacritic textMarks in text extraction
* Reinstated a diacritic recombination test.
* Small code reorganisation
* Reinstated handling of rotated text
* Addressed issues in PR review
* Added color fields to TextMark
* Updated README
* Reinstated the disabled tests I missed before.
* Tightened definition for tables to prevent detection of tables where there weren't any.
* Compute line splitting search range based on fontsize of first word in word bag.
* Use errors.Is(err, core.ErrNotSupported) to distinguish unsupported font errorrs.
See https://blog.golang.org/go1.13-errors
* Fixed some naming and added some comments.
* errors.Is -> xerrors.Is and %w -> %v for go 1.12 compatibility
* Removed code that doesn't ever get called.
* Removed unused test
* Refactor text field rotation
* Add rotation support for checkbox fields
* Add rotation support for combobox fields
* Add rotation support for text combobox fields
* Add documentation for the applyRotation of the AppearanceStyle
